方式一：利用Time.datelTime;
float timeBetween
float timer+=Time.daltaTime;
if(timer>=timeBetween)
{
timer=0f；
********代码*********}
方式二：利用Time.time
public float timeBetween;
float time;
if(Time.time-time>=timeBetween)
{
time=Time.time}
原文：http://www.cnblogs.com/HeYIcengshuo/p/6411552.html